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问题 单项选择题

对发生事故而没有煤矿领导带班下井的煤矿，对其主要负责人依法暂扣或者吊销其（），并依照规定处以罚款。

A.安全资格证

B.矿长资格证

C.安全资格证和矿长资格证

答案

参考答案：C

句型转换

根据括号里的要求改写句子。

1. The little child needn't be looked after by them. (改为主动句)

    They ________ the little child.

2. Our English teacher often tells us to speak English in class. (改为被动句)

   We ________ often ________ speak English in class by our Eng- lish teacher.

3. The room is used to play ping-pong by people. (改为主动句)

    People ________ the room ________ ping-pong.

4. We saw a lot of students playing games on the playground. (改为被动句)

    A lot of students ________ games on the playground.

5. Li Feng made the baby stop crying. (改为被动句) 

   The baby _________ crying by Li Feng.

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单项选择题

一期愈合的瘢痕抗拉强度达高峰的时间大约为：

A．180天

B．60天

C．30天

D．90天

E．5～7天
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